Safety expansion brake drum



W. CZ. TROUT SAFETY EXPANSION BRAKE DRUM Filed July 5, 192a INVENTOR.

vi A TTORNEY.

Aug. 5 1924.

Patented Aug. 5, T924,

UhllTED STATES WALTER c. racer,

or terms, reams.-

SAFETY EXPANSION BRAKE DRUM.

Application filed July 3,

exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in brake drums and is particularly applicable to the'type of brake drum used on draw works in connection with the operation of oil well drilling and pumping.

An objectof my invention is to provide a detachable drum band for brake drums which may be easily manufactured and assembled, and which will be so constructed as to allow "for expansion thereof under heat without damage to the same.

Another object is to provide a brake drum of the type described, having particular means for preventing the sliding of the said band relative to the drum.

These and other objects and advantages of my invention will appear more clearly from the more detailed specification which follows.

Referring to the drawing herewith, wherein a preferred embodiment of my invention is disclosed, Fig. 1 is a side elevation of a hoisting drum to which my improvement has been applied; certain parts being broken! away for greater clearness;

Fig. 2 is a central transverse section of one endof the hoisting drum taken approximately on the line 2-2 of Fig. 1; ig. 3 is ab assembledview showing the manner in which my brake is employed in connection with a hoisting drum.

In'the use of a hoisting drum for drilling operations, it is a common difliculty to have the brakedrum surface heat up excessively in use.

the weight on the cable causes the drum to rotate rapidly and it is necessary to apply the brake band to prevent too rapld dropping of the tools. In a deep well wherein the continuous unreeling of .the cable lasts through an unusually long period, there is danger of the overexpansion of the brake drum and the lining thereof, and it is not uncommon to have the brake drum This occurs principallywhen tools are lowered from thd'surface' of the earthvintq deep wells. In such cases- 1923. Serial No. 649,924..

expand unduly under heat, and break. With the employment of my inwention it is believed that this common diflieulty will be avoided.-

In the drawin I have illustrated a brake drum 1 mounts upon a transverse shaft 2 for-rotation with said shaft,the shaft, in operation being mourned in bearings at each end thereof.

The drum comprises a central hollow cylindrical reel 3 having at each end a hub l fitting within the central opening therein. There is on said hub a radial flange or plate 5 forming The reel '3 fits with in an annular slot til in the side of said flange, thus making a close fit therewith. Spaced inwardly from the outer edge 7 oil the flange 5 is a laterally extending drum support 8. The plate 5, as shown particuarly in Fig, 1, is reinforced by strengthening ribs 9 extending like spoltcs of a Wheel from the central hub outwardly to the said drum support. At spaced intervals along the drum support on the inner surface thereof are formed bosses 10 through which transverse openings-ll are ,in position by said bolts 12 previously referred to. y

In the adjacent faces'of the plates 5 and 13 and spaced slightly outward from the brake drum support 8 are formed grooves .or recesses 16 to receive the sides oi the brake drum band 15. It will be noted that when the said bandis placed in position and theplate 13 clamped in place by means side supporting member 'tor the hoisting drum,

ill).

of the bolts 12, the said brake drum band will be held securely in position. The facing 15 for the, drum is made in a plurality of sections, and in the drawing I have shown four such sections. Each section 17 thus formed has an; inwardly proat their adjacent ends to allow sufficient room for expansion under heat, and 1t W1ll be noted that th lugs 18 fit somewhat In the operation of my improved device,

the hoisting drum is assembled in the manner shown and described, and the, sectional brake drum band is secured in position upon the support 8: The outer plate 13 is then by means of bolts 12. in this manner the drum is ready for use, andin case of Wear or for other reasons it becomes necessary to renew or replace the removable drum, it may be done in an obvious manner Without the necessity oi"? an entirely new brake drum. When. the device is being the contact of the brake hand 20 with the facing 15 for the drum will set up a certain amount of heat, and under continuous use this heat may become excessive.

"lhe fact that the sections of the drum are paced apart and the drum itself mounted loosely in position, "the expansion of the drum under this use may take place Without injuriugin any Way the operation of the complete device. Accidents which ordinarily occur with the common type of brake drum will he thereby entirely eliminated.

While I have shown the application of my invention to draw Works for Well operations, it is obvious that it has awide use and it do not wishto he confined to its application to this particular form of apparatus.

im-lat I claim is new and desire to protect by Letters Patent Ii. in hoisting drui a brake drum} comprising drum support, a removable clamped .in position,

drum band madenp'of a plurality of sections spaced apart, means on each section to prevent slipping of said sections on said drum support, and means to secure said sections on said'support, including an outer retaining plate on said support, having a groove to receive said sections.

2. In a hoisting drum, a brake drum, comprising a drum support, a removable drum band made. up of a plurality of sections spaced slightly apart, a lug on each said sections fitting within a groove in the drum supportand lateral retaining flanges, and means to secure said sections on said support.

3. In a hoisting drum, a brake drum, comprising a drum support, a removable drum band made up of a plurality of sections, and inwardly projecting lugs on said sections fitting loosely in grooves in said support whereby said drum band may expand under heat, and lateral flanges on said support to retain said drum band in position. Y

4. A brake drum comprising a hub. a radial flange thereon, a laterally projecting cylindrical drum support thereon, a removable drum band on said support made up of sections and means to secure said dru-m'banol on said support.

A brake drum comprising a hub, a radial flange thereon, a laterally projecting cylindrical drum support thereon, a removable drum band on said support made up of sections, means to secure said drum band on said support and means to prevent sliding of said drum band on said support.

In testimony whereof, I hereunto aiiix my signature this 31 day of May, A. D. 1923.

WAL'iEiI O. TROUT. 

